Public bug reported:
Connecting to a remote Libvirt instance on Ubuntu 12.04 (libvirt 0.9.8)
via, e.g., virsh -c qemu+tls://hostname.example.com/system simply hangs.
I have to terminate virsh with Ctrl+C to get my terminal back.
Connecting to the same remote Libvirt instance via unencrypted TCP
(qemu+tcp) or via SSH (qemu+ssh) works. Connecting to a different
Libvirt instance on Ubuntu 10.04 from the same client machine as above
via qemu+tls works fine, too. So this looks like a regression to me, if
that term applies here.
What is interesting is that the remote connection via qemu+tls to the
problematic Libvirt instance *works* in many cases when I run strace on
the daemon process AND the strace output goes to stdout. Could this
indicate a race condition somewhere in the Libvirt (or TLS/SSL) code?
Seeing as tracing system calls and printing them to stdout generally and
noticeably impacts performance?
I will attach debug logs from the problematic remote Libvirt daemon as
well as strace outputs, one of each where the connection worked (thanks
to the strace voodoo) and one of each where the connection hung
(hanged?).
In the "hang" debug logs there is a line "authentication failed: TLS
handshake failed A TLS packet with unexpected length was received." This
indicates my pressing Ctrl+C on the remote client side (terminating the
hanging virsh process). In the "works" debug logs there is also one such
line, which indicates one connection attempt failed in the described
manner, but after it follows a connection attempt that worked. As I
said, the strace voodoo makes *most* connection attempts work, but not
all. Again, this indicates to me some kind of race condition somewhere.
Please let me know what I can do to debug and test this further.
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1001798
Title:
Remote TLS connection to Libvirt 0.9.8 hangs (possibly a race
condition and very possibly a regression)
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